Tunnel Ram Intake Manifold Plenum Segmentation for Low RPM Torque
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Solution Overview
Problem
Tunnel ram intake manifolds are not suitable for low-RPM operation in street applications due to reduced torque production and are not aesthetically compatible with electronic port fuel injection systems, which are expensive and require specialized knowledge for tuning.
Innovation Solution
A tunnel ram manifold design that divides the large single plenum into four separate plenums, each connected to only two intake runners, maintaining the race car appearance while improving low RPM performance by ensuring high peak velocity through the carburetor venturi, even at low RPMs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional tunnel ram intake manifold with a single large plenum is used, then high RPM power production is improved, but low RPM torque production deteriorates
Solution Approach 1:
The patent divides the single large plenum into four separate plenums, each serving two intake runners. This segmentation allows each plenum to deliver air to specific cylinders independently, enabling better control of air-fuel mixture at low RPM while preserving the high RPM performance benefits of the tunnel ram configuration.
2Shape
If a tunnel ram intake manifold is used with carburetors, then the authentic carbureted racing engine appearance is maintained, but fuel distribution and low RPM performance deteriorate
Solution Approach 1:
By segmenting the plenum into four separate chambers, each connected to specific intake runners, the patent improves fuel distribution to each cylinder while maintaining the carburetor configuration. This allows proper fuel metering at low RPM without sacrificing the authentic carbureted appearance.
3Power
If the engine is operated at high RPM to match the tunnel ram design, then maximum power production is achieved, but drivability in street applications deteriorates
Solution Approach 1:
The segmented plenum design allows the engine to operate effectively at lower RPM ranges for street driving while still capable of high RPM power production. The independent plenums provide better air control for city driving conditions, improving drivability without sacrificing the high RPM performance potential.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances low RPM engine performance without compromising high RPM capabilities and maintains the authentic carbureted racing engine appearance, addressing the limitations of traditional tunnel ram intake manifolds.
Implementation Method 1
each plenum will present only one carburetor venturi to the cylinder in a low-RPM, low-throttle opening induction event, thus keeping the peak velocity through the carburetor's venturi high
Data Source
AI summary
A manifold including first and second divider bodies each having a carburetor mounting flange. The first divider body includes a first and a second plenum, and the second divider body includes a third and a fourth plenum. A first pair of runners extends from the first port flange to the first plenum; a second pair of runners extends from the first port flange to the third plenum; a third pair of runners extends from the second port flange to the second plenum; and a fourth pair of runners extends from the second port flange to the fourth plenum. Accordingly, in operation, each plenum will present only one carburetor venturi to the cylinder in a low-RPM, low-throttle opening induction event, thus keeping the peak velocity through the carburetor's venturi high even at low RPM.